What is quieter PVC or flex

My flex tubing for my drain out of my 75 gal is loud. It doesn't go straight down, it curves due to the flex having PVC in it. It's just too loud for our liking. My LFS guy told me hard pluming is quieter, but I've heard flex tubing is quieter. I'd like to fix this asap. What would be best?

 

PVC is quieter, gut get a gate valve, (ball valves work too but not as easy) and you'll be able to make it silent

 

Sounds like you may be taking in alot of air a gate valve works well with flex also. The problem may be at your overflow too?

 

Please think twice before putting ANY valves on the return to the sump.

The minute there is a mismatch with your return pump- you'll be mopping up water!

 

+1 to Todd's post.

If you want to try and "match" your flow, do it on the return end, and I'd do it by bleeding some of the return flow back to the sump (use a T and a valve). That way the pump always runs wide open, but your return flow will vary based on the amount you bleed off back to the sump.

Your problem likely isn't in your plumbing material (I use flex tubing exclusively in all of our systems, and have for many years), but rather lies in your standpipe design...are you using a Durso or Stockman style low-noise standpipe? If not, you should begin there.

Here's an article on how to build a Durso-style standpipe:

How to build a standpipe
and bring quiet into your home.


Note: we no longer use the intake strainer (optional part #9) on our SP's. They're harder to keep clean and have been unnecessary for our applications.

 

I agree with not installing a valve on overflow lines to adjust water. I was answering to hard pipe better than flex question i didn't word it well....
Most pumps now days draw less watts when valved down so it maybe that using a tee to run pump wide open will cost more if not needed for flow? Check info on pump may save you a little